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United States Patent | 6,103,944 |
Blake ,   et al. | August 15, 2000 |
Water present in a hot gaseous product stream from a reactor system A.B (FIG. 1) containing hydrogen fluoride is separated from the stream in order to eliminate a potentially corrosive combination of water and HF. The water is removed by contacting the gaseous product stream with liquid HF in a distillation column so as to obtain a bottoms product containing liquid HF and water and a top product containing dry HF and the product to be recovered. The invention encompasses the separation process, a vessel for carrying out the process (FIGS. 2 to 4), a control system for the liquid HF supply to the distillation column (FIGS. 5 and 6) and a recovery system for recovering HF employed during operation of the reactor system in different regimes employing HF as a fluorination agent, as a diluent during catalyst regeneration and/or catalyst prefluorination (FIG. 7).
Inventors: | Blake; Charles Brian (Chester, GB); Forsyth; James Malcolm (Manchester, GB); Liow; Ann San (Runcorn, GB); Adams; Stephen John (Warrington, GB); Doy; Ralph Jones (Cleveland, GB); Brierley; Rowland John Porter (Cleveland, GB); Roberts; Jane Andrea Eileen (Chester, GB); Schofield; Brian (Atherton, GB); Shilling; Neil David (Northwich, GB) |
Assignee: | Imperial Chemical Industries PLC (London, GB) |
Appl. No.: | 235927 |
Filed: | May 2, 1994 |
Dec 10, 1991[GB] | 9126228 | |
Sep 03, 1992[GB] | 9218607 | |
Sep 15, 1992[GB] | 9219469 |
Current U.S. Class: | 570/165; 95/231; 423/240R; 423/241; 423/488; 502/514; 570/166; 570/167; 570/168; 570/169; 570/177 |
Intern'l Class: | C01C 017/08; C01C 019/08; B01D 053/14 |
Field of Search: | 423/488,241,240 R 95/231,233 570/165,166,167,168,169,177 502/514 |
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3300538 | Jan., 1967 | Kometani et al. | 570/177. |
3725536 | Apr., 1973 | Gentili | 95/233. |
3792104 | Feb., 1974 | Mueller | 585/609. |
3855399 | Dec., 1974 | van Eiji | 423/488. |
3919399 | Nov., 1975 | Schabacher et al. | 423/488. |
4150102 | Apr., 1979 | Schabacher et al. | 423/488. |
5171899 | Dec., 1992 | Furutaka et al. | 570/164. |
5208398 | May., 1993 | Wismer | 570/177. |
5243105 | Sep., 1993 | Scott et al. | 570/165. |
Foreign Patent Documents | |||
0283965 | Sep., 1988 | EP. | |
0449617 | Oct., 1991 | EP. | |
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